Use ramsey/composer-install action

[szepeviktor]

This action includes caching and everything else necessary for dependency installation.
https://github.com/ramsey/composer-install

As @GromNaN told me.

[GromNaN]

I'm not a maintainer, I wouldn't pretend to decide. But I think it's a good idea to simplify the CI maintenance.

[szepeviktor]

This is an extra from the man page of git.

[weirdan]

Before merging this I'd like to see how it works on master. The important bit is COMPOSER_ROOT_VERSION to allow cyclic dependencies, and I don't think ramsey/composer-install can handle it when composer cannot figure out the version (like it happens on master).

[szepeviktor]

Where should I add COMPOSER_ROOT_VERSION?

[weirdan]

I think you can't. But maybe composer got smarter over the years and this is no longer required - we'll know when you target this PR (or create a new one) to the master branch.

[szepeviktor]

COMPOSER_ROOT_VERSION is currently present in several steps.

[weirdan]

It's missing at least in bcc workflow. If it works with composite actions, that is.

[szepeviktor]

Added 🍏